Describe why Alleles occur in pairs?

Alleles occur in pairs because they're both traits / genes from the mother and father (one allele being the mother and the other being the father)

True or False?

Alleles occur in pairs because chromosomes come in pairs for each trait, there will be two possible alleles. These different versions of genes (alleles) occur as the DNA base sequence is different. This combination of alleles for each trait is called the genotype; this can be any combination of two of the available alleles.